I ask the factory (service ans parts dept.) about two years ago: grease it, with no spec.

Allways no problems to undo the spinners. I was also in contact with MWS when I change over from hex-nuts to twoeared spinners:
also grease the threads and where the nuts Center the hub! And: for both nuts no special torque.

Greets René

2018 plus4 (sports green)
with a homemade really shiny red tinted dash…